Accelerometer sensor
Accelerometers are devices widely used for applications as diverse as vibration monitoring, appliance control, joysticks, industrial process control, space launches, satellite control, and many others. Accelerometers typically find use in applications including automobile air bags and suspension systems, computer hard disc drivers, smart detonation systems for bombs and missiles and machine vibration monitors. Linear accelerometers are frequently employed to generate an output signal proportional to linear acceleration for use in a vehicle control system. Angular accelerometers are employed to measure the second derivative of angular rotation with respect to time. In some machine controlled applications, a measurement of angular acceleration is often needed as a direct input to a control system. Z-axis accelerometers can be used to control side air bags, vehicle control and multi-axis sensing systems. The accelerometers are mainly fabricated through the semiconductor process, and classified into piezoelectric, piezoresistant and capacitance accelerometers. Capacitance accelerometers employ a capacitor between the mass and a support structure, and measure the variable capacitance between the two. A capacitance accelerometer shows a small level of characteristic change according to temperature variation, allows a field effect transistor of a high integrity to constitute a signal processing circuit without additional processes. Accelerometers require either a frequency or voltage reference.
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